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eclecticism, in philosophy

(Encyclopedia)eclecticism ĭklĕkˈtĭsĭzˌəm [key] [Gr. eklektikos=to choose], in philosophy, the selection of elements from different systems of thought, without regard to possible contradictions between the sy...

sublimation, in chemistry

(Encyclopedia)sublimation sŭblĭmāˈshən [key], change of a solid substance directly to a vapor without first passing through the liquid state. The term is also used to describe the reverse process of the gas ch...

Al-Battani

(Encyclopedia)Al-Battani ălˌbətēˈnēəs [key], b. before 858, d. 929, Arab astronomer and mathematician. He is best known in astronomy for his improvements and corrections of the Ptolemaic tradition. His Kitab...

occultation

(Encyclopedia)occultation ŏkˌəltāˈshən [key], in astronomy, eclipse of one celestial body by another, e.g., when the moon lies between a star and the earth. Occultations of stars by the moon are important in ...

Doppler effect

(Encyclopedia)Doppler effect, change in the wavelength (or frequency) of energy in the form of waves, e.g., sound or light, as a result of motion of either the source or the receiver of the waves; the effect is nam...

columbine, in botany

(Encyclopedia)columbine kŏlˈəmbīn [key], any plant of the genus Aquilegia, temperate-zone perennials of the family Ranunculaceae (buttercup family), popular both as wildflowers and as garden flowers. Columbines...

earth, in chemistry

(Encyclopedia)earth, in chemistry, metallic oxide not readily reducible by chemical means, e.g., alkaline earths, rare earths, and alumina. The name is also applied to certain absorbent clays, e.g., fuller's earth,...

Capella, Martianus

(Encyclopedia)Capella, Martianus märshēāˈnəs kəpĕlˈə [key], fl. 5th cent.?, Latin writer, b. Carthage. His one famous work, The Marriage of Mercury and Philology, also called the Satyricon and Disciplinae,...

astrophysics

(Encyclopedia)astrophysics, application of the theories and methods of physics to the study of stellar structure, stellar evolution, the origin of the solar system, and related problems of cosmology. The distinctio...

Flammarion, Camille

(Encyclopedia)Flammarion, Camille kämēˈyə flämäryôNˈ [key], 1842–1925, French astronomer and author. He served for some years at the Paris Observatory and the Bureau of Longitudes, and in 1883 he set up a...